noun, plural plumbagos.
a drawing made by an instrument with a lead point.

1595–1605; < Latin plumbāgō, translation of Greek molýbdaina lead ore, derivative of mólybdos lead Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
plumbago (plʌmˈbeɪɡəʊ)
n , pl -gos
1.  See also leadwort any plumbaginaceous plant of the genus Plumbago, of warm regions, having clusters of blue, white, or red flowers
2.  another name for graphite
[C17: from Latin: lead ore, leadwort, translation of Greek polubdaina lead ore, from polubdos lead]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"graphite," 1784, from L. plumbago "a type of lead ore, black lead," from plumbum "lead" (see plumb); it renders Gk. molybdaina, which was used of yellow lead oxide and also of a type of plant.
Online Etymology Dictionary, © 2010 Douglas Harper
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